A new species of Succinea Draparnaud from extreme south of Argentina

Abstract

A new species of Succinea from Santa Cruz Province (Argentina) is described.Succinea argentina sp. nov. is characterized by the following features: a shell ofregular growth, 3 to 3.25 whorls, length of 6.0 to 7.15 mm, shell not succineid,opaque walls and conspicuous axial ribs; straw-yellow opaque deciduous periostracum;radular formula: 21-9-C-9-21, with central tooth tricuspid, lateral teethbicuspid and marginal teeth tricuspid; penis with epiphallus, wrapped in a commonsheath, without appendices, and formed by two regions: a long proximal region,which is lined by a mucosa with multiple transverse folds, and a short distalregion, which opens into the atrium; vas deferens composed of three main regions? pre-prostatic, prostatic and post-prostatic ?, entering the epiphallus subterminally,and covered by a mucosa with multiple folds of different sizes; vagina long,thin and convolute; spermatheca globose, with a long duct that opens in the lastportion of the vagina; atrium short.